6JBQ

CryoEM structure of Escherichia coli sigmaE transcription initiation complex containing 5nt of RNA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.02 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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This is version 1.4 of the entry. See complete history


Literature

Structures and mechanism of transcription initiation by bacterial ECF factors.

Fang, C.Li, L.Shen, L.Shi, J.Wang, S.Feng, Y.Zhang, Y.

(2019) Nucleic Acids Res 47: 7094-7104

  • DOI: https://doi.org/10.1093/nar/gkz470
  • Primary Citation of Related Structures:  
    6JBQ, 6JCX, 6JCY

  • PubMed Abstract: 

    Bacterial RNA polymerase (RNAP) forms distinct holoenzymes with extra-cytoplasmic function (ECF) σ factors to initiate specific gene expression programs. In this study, we report a cryo-EM structure at 4.0 Å of Escherichia coli transcription initiation complex comprising σE-the most-studied bacterial ECF σ factor (Ec σE-RPo), and a crystal structure at 3.1 Å of Mycobacterium tuberculosis transcription initiation complex with a chimeric σH/E (Mtb σH/E-RPo). The structure of Ec σE-RPo reveals key interactions essential for assembly of E. coli σE-RNAP holoenzyme and for promoter recognition and unwinding by E. coli σE. Moreover, both structures show that the non-conserved linkers (σ2/σ4 linker) of the two ECF σ factors are inserted into the active-center cleft and exit through the RNA-exit channel. We performed secondary-structure prediction of 27,670 ECF σ factors and find that their non-conserved linkers probably reach into and exit from RNAP active-center cleft in a similar manner. Further biochemical results suggest that such σ2/σ4 linker plays an important role in RPo formation, abortive production and promoter escape during ECF σ factors-mediated transcription initiation.


  • Organizational Affiliation

    Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alpha
A, B
329Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoApezphssezb3295JW3257
EC: 2.7.7.6
UniProt
Find proteins for P0A7Z4 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0A7Z4
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UniProt GroupP0A7Z4
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta1,342Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoBgroNnitBrifronstlstvtabDb3987JW3950
EC: 2.7.7.6
UniProt
Find proteins for P0A8V2 (Escherichia coli (strain K12))
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UniProt GroupP0A8V2
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'1,416Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoCtabBb3988JW3951
EC: 2.7.7.6
UniProt
Find proteins for P0A8T7 (Escherichia coli (strain K12))
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UniProt GroupP0A8T7
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omega91Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoZb3649JW3624
EC: 2.7.7.6
UniProt
Find proteins for P0A800 (Escherichia coli (strain K12))
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
ECF RNA polymerase sigma-E factor219Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoEsigEb2573JW2557
UniProt
Find proteins for P0AGB6 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0AGB6
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UniProt GroupP0AGB6
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  • Reference Sequence
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Entity ID: 6
MoleculeChains LengthOrganismImage
DNA (48-MER)48synthetic construct
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Entity ID: 7
MoleculeChains LengthOrganismImage
DNA (48-MER)48synthetic construct
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Entity ID: 8
MoleculeChains LengthOrganismImage
RNA (5'-R(*CP*UP*CP*GP*A)-3')5synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.02 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.14
RECONSTRUCTIONRELION2.1

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31670067 and 31822001

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2019-06-05
    Changes: Data collection, Database references
  • Version 1.2: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-06
    Changes: Data collection, Other
  • Version 1.4: 2024-03-27
    Changes: Data collection, Database references, Derived calculations, Refinement description